Liquified propane piping materials
Liquified propane piping materials
(OP)
Does anybody have recommendations as to what piping materials to use for liquified propane ? I've heard that some companies specify the use of low temp carbon steels (LTCS) typically ASTM A333 Gr.6 for pipe, whilst some companies specify the use of carbon steel typically API 5L ?





RE: Liquified propane piping materials
RE: Liquified propane piping materials
Normal operating condition for liquid propane may be at room temperature. However, during startup and depressizing condition, the temperature may drop below minus 20 oF. To prevent britle fracture, charpy test is recommended to ensure the material can withstand the min temperature.
RE: Liquified propane piping materials
RE: Liquified propane piping materials
RE: Liquified propane piping materials
SooCS
"...However, during startup and depressizing condition, the temperature may drop below minus 20 oF. To prevent britle fracture, charpy test is recommended to ensure the material can withstand the min temperature...."
Which is the recommendable temperature to do the test, to prevent the condition presented before?
Regards
Federico Spiegel
RE: Liquified propane piping materials
Let's say you consider the case of the pipe full of boiling propane at atmospheric pressure during startup or shutdown (or maybe low pressures during operation). The liquid propane will be about -40F if it is at atmospheric pressure. That would be the temperature you'd need to ensure the metal had sufficient toughness (which is what the Charpy test measures) to prevent brittle failure.
I'm currently putting in some small bore piping that can handle propane and it's just standard A-106 pipe, A-105 fittings, etc. This client choices to use this material rather than low temperature based on their experience.
RE: Liquified propane piping materials
Is there a way to correlate the results of the test at, let´s say, -5°C (23°F) to a lower temperature and still be valid?
Thanks for the quick answer
Best regards
Federico Spiegel
RE: Liquified propane piping materials
RE: Liquified propane piping materials
That was what I thought. I was told that a correlation existed but I just cannot find it, if it exist.
Thanx
You´ve been very helpfull